METAL HALIDE LAMP WITH HALOGEN-PROMOTED WALL CLEANING CYCLE

A lamp includes a discharge vessel. Tungsten electrodes extend into the discharge vessel. An ionizable fill is sealed within the vessel. The fill includes a buffer gas, optionally free mercury, a halide component which includes a rare earth halide selected from the group consisting of lanthanum hali...

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Bibliographic Details
Main Authors RAHMANE MOHAMED, RUSSELL TIMOTHY D, UTTERBACK GARY W, MESCHTER PETER J
Format Patent
LanguageEnglish
Published 11.06.2009
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
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Summary:A lamp includes a discharge vessel. Tungsten electrodes extend into the discharge vessel. An ionizable fill is sealed within the vessel. The fill includes a buffer gas, optionally free mercury, a halide component which includes a rare earth halide selected from the group consisting of lanthanum halides, praseodymium halides, neodymium halides, samarium halides, cerium halides, and combinations thereof, a source of available halogen. The discharge vessel optionally includes a source of available oxygen. The source of available halogen and optional source of available oxygen are present in an amount such that the vapor phase solubility of tungsten species in the fill during lamp operation is lower adjacent at least a portion of one of the electrodes than at a wall of the discharge vessel, such that tungsten deposited on the wall during lamp operation is transported back to the electrode.
Bibliography:Application Number: US20070951724